What Are The White Stones On Flat Roofs?
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They are often referred to as “gravel ballast.”
These stones serve several purposes…
- Protection – Gravel ballast protects roofing material and extends its lifespan.
- Weight distribution – Gravel on flat roofs prevents wind uplift.
- Heat reflection – White stones reflect sunlight, reducing roof heat absorption. This lowers cooling costs and minimizes heat transfer into interior spaces.
- Fire protection – Gravel ballast can provide some level of fire protection for the roof by acting as a barrier between the roofing material and any potential ignition sources.
Overall, gravel ballast is a common feature of flat roofs and serves multiple functional purposes in protecting and maintaining the integrity of the roofing system.
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